ath9k_htc: implement sta_rc_update() mac80211 callback

In case of changes in the supported rates set for a given station, it is now
possible to use this callback to update the current internal state of the
station in the htc driver.
Reported-by: Gui Iribarren <gui@altermundi.net>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/htc_drv_main.c

@@ -1333,6 +1333,34 @@ static int ath9k_htc_sta_remove(struct ieee80211_hw *hw,
 	return ret;
 }
 
+static void ath9k_htc_sta_rc_update(struct ieee80211_hw *hw,
+				    struct ieee80211_vif *vif,
+				    struct ieee80211_sta *sta, u32 changed)
+{
+	struct ath9k_htc_priv *priv = hw->priv;
+	struct ath_common *common = ath9k_hw_common(priv->ah);
+	struct ath9k_htc_target_rate trate;
+
+	mutex_lock(&priv->mutex);
+	ath9k_htc_ps_wakeup(priv);
+
+	if (changed & IEEE80211_RC_SUPP_RATES_CHANGED) {
+		memset(&trate, 0, sizeof(struct ath9k_htc_target_rate));
+		ath9k_htc_setup_rate(priv, sta, &trate);
+		if (!ath9k_htc_send_rate_cmd(priv, &trate))
+			ath_dbg(common, CONFIG,
+				"Supported rates for sta: %pM updated, rate caps: 0x%X\n",
+				sta->addr, be32_to_cpu(trate.capflags));
+		else
+			ath_dbg(common, CONFIG,
+				"Unable to update supported rates for sta: %pM\n",
+				sta->addr);
+	}
+
+	ath9k_htc_ps_restore(priv);
+	mutex_unlock(&priv->mutex);
+}
+
 static int ath9k_htc_conf_tx(struct ieee80211_hw *hw,
 			     struct ieee80211_vif *vif, u16 queue,
 			     const struct ieee80211_tx_queue_params *params)
@@ -1760,6 +1788,7 @@ struct ieee80211_ops ath9k_htc_ops = {
 	.sta_add            = ath9k_htc_sta_add,
 	.sta_remove         = ath9k_htc_sta_remove,
 	.conf_tx            = ath9k_htc_conf_tx,
+	.sta_rc_update      = ath9k_htc_sta_rc_update,
 	.bss_info_changed   = ath9k_htc_bss_info_changed,
 	.set_key            = ath9k_htc_set_key,
 	.get_tsf            = ath9k_htc_get_tsf,